default material properties
Hi all, When I want to add the material to the design, automatically relative permittivity, relative permeability and electrical conductivity values are asked. On the other hand, I just want to write...
View ArticleBow-tie antenna transmission Port
hi everyone, I am currently working on a modeling of a bow-tie antenna for gpr application. Although I am new to Comsol but i have tried to build the geometry. presently i am stuck on the transmission...
View ArticleExploiting symmetries while using Floquet boundary conditions
Hello! I have a periodic structure which utilizes Floquet BC's. The cubic unit cell has uniaxial 4-fold symmetry about the vertical y-axis. I am using a periodic port to launch a TM mode wave,...
View ArticleSimulating 2D optical waveguide
Hi, I am simulating a 2D optical waveguide for both TE and TM modes. For TE waves I get reasonable result by setting the cladding core interface as perfect electric conductor. I use excitation port...
View ArticleCOMSOL Error for Initial Values(RF Module)
I am defining a model with different concentrations of oil and water and trying to measure the heat distribution by using the microwaves. But I obtained the error mentioning Initial values: THE...
View ArticleWhy Comsol much slower than HFSS?
Dear all, I am just simulating a basic patch antenna and I see that HFSS is much faster than the Comsol? Any idea to improve process? Thanks in advance
View Articledefault material properties
Hi all, When I want to add the material to the design, automatically relative permittivity, relative permeability and electrical conductivity values are asked. On the other hand, I just want to write...
View ArticleStudy1 is sweep of the wavelength and the consequence is used in Study 2, but...
Hello all ! I'm puzzled that how to calculate the EQE of the solar cell , I used the light(rf module) to calculate the G (sweep of the wavelength) and electrostatics1 to calculate the phi0; two...
View ArticlePML problem in groove waveguide
Hi, I have been trying to simulate the radiation pattern of a small dipole inside a groove carved into a gold substrate (transversal shape is triangular). The simulation box is rectangular, and I set 4...
View Articleneed some help in photonic crystal
Dear all: I want to get band diagram of 3D photonic crystal of a simple structure, which is made of a sphere of a cubic.I followed the instruction of the 2D e.g. But it doesn't work.I set F-B condition...
View ArticleDerived value calculation from independant (electromagnetic+solid)...
Hello I have built a 3D model of a nanostructure for which I want to calculate some coefficients that are calculated using some integrals that depend on both the electromagnetic and the displacement...
View Articlesymmetry of the boundary condition
Hi all, I'm designing a pin diode to calculate the quantum efficiency. Before calculating the electric field, I need to idetify the forts of the structure. I have chosen the bottom and top surface as...
View ArticlePolarization type in RF module frequency domain
I make a modeling for multi layer structure in 2D , I made the calculation in normal incidence case TE polarization. As I understand from COMSOL tutorial model (plasmonic diffraction grating ) found...
View ArticleProblem when simulating nanowire absorption
Hy all, I'm simulating the absorption of a nanowire in vaccum. I started with a 2D model in the RF module. My geometry is a nanowire in vacuum surrounded by cartesian air-PML. I solved the problem for...
View ArticleX and Z polarization 2D for normal and oblique incidence
Dear COMSOL community I make a modeling for multi layer structure in 2D , I use COMSOL tutorial model (plasmonic diffraction grating ) found the model library. to setup the setting for Z polarization...
View ArticleBioheat, very high temperatures
Hello all, I solved the tutorial for microwave heating of biological tissue using Bioheat and EMW Physics and it seemed pretty straight forward. However, when I try implementing the same principle in...
View ArticleFar field in RF MODUL
HI I feel something is wrong in far-field calculation in RF module. Please have a look at the attached mph file. There is a simple square where an EM wave comes in from one side and exits from the...
View ArticleWaveguide Modeling
Hi, I am trying to make a simple model where a light source is incident of an input port of a waveguide and then it passes through a different media. I need to see the output power (Intensity) at port...
View Articlebioheat
Hi I am going to investigate light distribution in brain layers which is exposed by wavelengths of IR and visible lights and then check their "heat transfer" by "bioheat" section in Comsol. How can I...
View Articlewhy the scattering cross section calculation result is negative?
Hi, I am doing some calculation with comsol 4.2a, and I manage to do the scattering cross section calculation for the sphere model. Then I use exactly the same model, but change the sphere scatter to...
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